Does anyone know is this issue only for newest version? (may be I should use older version of sage)
On 8 дек, 21:47, David Joyner <wdjoy...@gmail.com> wrote: > Unfortunately, the piecewise class was written before the symbolic > expressions class and has not kept pace. > > The obvious solution produced this: > > sage: signal = Piecewise([[(0,1), cos(2*pi*1*x)], [(-1, 0), 0*x]]) > sage: signal.integral(definite=True) > --------------------------------------------------------------------------- > TypeError Traceback (most recent call last) > > /Users/wdj/.sage/temp/jeeves.home/2806/_Users_wdj__sage_init_sage_0.py > in <module>() > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/functions/piecewise.pyc > in integral(self, x, a, b, definite) > 787 fun_integrated = fun.integral(x, end, x) > 788 else: > --> 789 fun_integrated = fun.integral(x, start, x) + area > 790 if definite or end != infinity: > 791 area += fun.integral(x, start, end) > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/symbolic/expression.so > in sage.symbolic.expression.Expression.integral > (sage/symbolic/expression.cpp:25344)() > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/calculus/calculus.pyc > in integral(expression, v, a, b, algorithm) > 635 else: > 636 try: > --> 637 result = expression._maxima_().integrate(v, a, b) > 638 except TypeError, error: > 639 s = str(error) > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/maxima.pyc > in integral(self, var, min, max) > 2023 if max is None: > 2024 raise ValueError, "neither or both of min/max > must be specified." > -> 2025 return I(var, min, max) > 2026 > 2027 integrate = integral > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc > in __call__(self, *args, **kwds) > 1402 > 1403 def __call__(self, *args, **kwds): > -> 1404 return self._obj.parent().function_call(self._name, > [self._obj] + list(args), kwds) > 1405 > 1406 def help(self): > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc > in function_call(self, function, args, kwds) > 1310 [s.name() for s in args], > 1311 > ['%s=%s'%(key,value.name()) for key, value in kwds.items()]) > -> 1312 return self.new(s) > 1313 > 1314 def _function_call_string(self, function, args, kwds): > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc > in new(self, code) > 1094 > 1095 def new(self, code): > -> 1096 return self(code) > 1097 > 1098 > ################################################################### > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc > in __call__(self, x, name) > 1029 > 1030 if isinstance(x, basestring): > -> 1031 return cls(self, x, name=name) > 1032 try: > 1033 return self._coerce_from_special_method(x) > > /Users/wdj/sagefiles/sage-4.2.1/local/lib/python2.6/site-packages/sage/interfaces/expect.pyc > in __init__(self, parent, value, is_name, name) > 1445 except (TypeError, KeyboardInterrupt, > RuntimeError, ValueError), x: > 1446 self._session_number = -1 > -> 1447 raise TypeError, x > 1448 self._session_number = parent._session_number > 1449 > > TypeError: Computation failed since Maxima requested additional > constraints (try the command 'assume(x>0)' before integral or limit > evaluation, for example): > Is x positive, negative, or zero? > > On Tue, Dec 8, 2009 at 4:28 PM, Sand Wraith <omegat...@gmail.com> wrote: > > Hello, > > > there is signal function: > > signal = Piecewise([ > > [(0,5), cos(2*pi*1*x) ], > > [(5,10), cos(2*pi*2.5*x) ], > > ]) > > > And window function: > > window = Piecewise([[(-1,1),1]]) > > > And the result function: > > r=window*signal > > > How can I integrate it now? I'am trying: > > r.integral(definite=True) > > > but it leads to error: "TypeError: integral() takes no arguments (3 > > given)" > > > -- > > To post to this group, send email to sage-support@googlegroups.com > > To unsubscribe from this group, send email to > > sage-support+unsubscr...@googlegroups.com > > For more options, visit this group > > athttp://groups.google.com/group/sage-support > > URL:http://www.sagemath.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
